/**
 * Software License, Version 1.0
 * 
 * Copyright 2003 The Trustees of Indiana University.  All rights reserved.
 * 
 *
 *Redistribution and use in source and binary forms, with or without 
 *modification, are permitted provided that the following conditions are met:
 *
 *1) All redistributions of source code must retain the above copyright notice,
 * the list of authors in the original source code, this list of conditions and
 * the disclaimer listed in this license;
 *2) All redistributions in binary form must reproduce the above copyright 
 * notice, this list of conditions and the disclaimer listed in this license in
 * the documentation and/or other materials provided with the distribution;
 *3) Any documentation included with all redistributions must include the 
 * following acknowledgement:
 *
 *"This product includes software developed by the Community Grids Lab. For 
 * further information contact the Community Grids Lab at 
 * http://communitygrids.iu.edu/."
 *
 * Alternatively, this acknowledgement may appear in the software itself, and 
 * wherever such third-party acknowledgments normally appear.
 * 
 *4) The name Indiana University or Community Grids Lab or NaradaBrokering, 
 * shall not be used to endorse or promote products derived from this software 
 * without prior written permission from Indiana University.  For written 
 * permission, please contact the Advanced Research and Technology Institute 
 * ("ARTI") at 351 West 10th Street, Indianapolis, Indiana 46202.
 *5) Products derived from this software may not be called NaradaBrokering, 
 * nor may Indiana University or Community Grids Lab or NaradaBrokering appear
 * in their name, without prior written permission of ARTI.
 * 
 *
 * Indiana University provides no reassurances that the source code provided 
 * does not infringe the patent or any other intellectual property rights of 
 * any other entity.  Indiana University disclaims any liability to any 
 * recipient for claims brought by any other entity based on infringement of 
 * intellectual property rights or otherwise.  
 *
 *LICENSEE UNDERSTANDS THAT SOFTWARE IS PROVIDED "AS IS" FOR WHICH NO 
 *WARRANTIES AS TO CAPABILITIES OR ACCURACY ARE MADE. INDIANA UNIVERSITY GIVES
 *NO WARRANTIES AND MAKES NO REPRESENTATION THAT SOFTWARE IS FREE OF 
 *INFRINGEMENT OF THIRD PARTY PATENT, COPYRIGHT, OR OTHER PROPRIETARY RIGHTS. 
 *INDIANA UNIVERSITY MAKES NO WARRANTIES THAT SOFTWARE IS FREE FROM "BUGS", 
 *"VIRUSES", "TROJAN HORSES", "TRAP DOORS", "WORMS", OR OTHER HARMFUL CODE.  
 *LICENSEE ASSUMES THE ENTIRE RISK AS TO THE PERFORMANCE OF SOFTWARE AND/OR 
 *ASSOCIATED MATERIALS, AND TO THE PERFORMANCE AND VALIDITY OF INFORMATION 
 *GENERATED USING SOFTWARE.
 */
package cgl.narada.util;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.text.DateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * Logging utility for debugging purposes.
 *
 * @author  John Yin
 * @version 1.0
 */

public class Log {

    private static Calendar      m_calendar = DateFormat.getDateTimeInstance(DateFormat.SHORT,DateFormat.SHORT).getCalendar();
    private static int           m_loglevel = 50;
    private static boolean       m_console = true;
    private static String        m_filename;
    private static PrintWriter   m_file = null;

    /**
     * -----------------------------------------------------------------
     */
    public static void setLogLevel(int level) {
        m_loglevel = level;
    }

    /**
     * -----------------------------------------------------------------
     */
    public static void setLogFile(String filename) {
        m_filename = filename;
        try {
            m_file = new PrintWriter(new FileOutputStream(m_filename));
        } catch (IOException e) {
            err("Log","Unable to open log file "+m_filename);
        }
    }

    /**
     * -----------------------------------------------------------------
     */
    public static void setConsoleOutput(boolean console) {
        m_console = console;
    }

    /**
     * -----------------------------------------------------------------
     */
    public static void log(String module,String msg) {
        log(System.out,0,module,msg,null);
    }

    /**
     * -----------------------------------------------------------------
     */
    public static void debug(String module,String msg) {
        log(System.out,50,module,msg,null);
    }

    /**
     * -----------------------------------------------------------------
     */
    public static void perf(String module,String msg) {
        log(System.out,90,module,msg,null);
    }

    /**
     * -----------------------------------------------------------------
     */
    public static void err(String module,String msg) {
        log(System.err,0,module,msg,null);
    }

    /**
     * -----------------------------------------------------------------
     */
    public static void err(String module,String msg,Exception e) {
        log(System.err,0,module,msg,e);
    }

    /**
     * -----------------------------------------------------------------
     */
    public static void warn(String module,String msg) {
        log(System.out,25,module,msg,null);
    }

    /**
     * -----------------------------------------------------------------
     */
    public static void warn(String module,String msg,Exception e) {
        log(System.out,25,module,msg,e);
    }

    /**
     * -----------------------------------------------------------------
     */
    private synchronized static void log(PrintStream cout,int level,String module,String msg,Exception e) {
        if (level > m_loglevel) return;

        m_calendar.setTime(new Date(System.currentTimeMillis()));
        if (m_console) {
            cout.print(m_calendar.getTime());
            cout.print(" ");
            cout.print("[");
            cout.print(module);
            cout.print("]: ");
            cout.print(msg);
            if (e != null) {
                if (cout.equals(System.err)) {
                    cout.println();
                    e.printStackTrace(cout);
                } else {
                    cout.print("{ Exception: ");
                    cout.print(e.getMessage());
                    cout.print("}");
                }
            }
            cout.println();
        }

        if (m_file != null) {
            m_file.print(m_calendar.getTime());
            m_file.print(" ");
            m_file.print("[");
            m_file.print(module);
            m_file.print("]: ");
            m_file.print(msg);
            if (e != null) {
                if (cout.equals(System.err)) {
                    e.printStackTrace(m_file);
                } else {
                    m_file.print("{ Exception: ");
                    m_file.print(e.getMessage());
                    m_file.print("}");
                }
            }
            m_file.println();
        }
    }

}
